Shoes, and running posture. When you are jogging, look 20-25metres ahead. Gentle loose-fist grip, slightly roll the shoulders. Land heel first slightly on the outside of the foot and then have it roll flat to the ball. If it goes onto the ball and off the little toe - SHOES
Breathing is inportant. Try the 2-2 pattern so as you run left-right-left-right breathe IN-IN-OUT-OUT. See?
When you get a stitch, say on your right side, swapp over your breathing starting foot, so if you started right foot IN-IN, swap it to left foot IN-IN-OUT-OUT so the FIRST breathe-in contraction is on the alternate foot. This swaps the combination of muscles that stabilises you and breathes you in and can alleviate a stitch.
At whatever point you get the pains coming on (say 1 mile for arguments) when you get HALF WAY stop and dynamic stretch for 90 secs, then stop on the MILE and dynamic stretch again.
Eat something starchy around 6 hours before running, and not to be too graphic, ensure you are completely 'empty' as the effort made by moving waste through your system can cause the pains you describe.
You may also have a pulled core muscle. All the organs hang from your head to toes, and the muscles that hold them will be getting stronger with running, and you could have twinged something in there. Sounds unlikely though as long rest has failed to relieve it. Try those things above if you like, see how you get on

good Luck!